From: Casey Schaufler <casey@schaufler-ca.com> To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: casey@schaufler-ca.com, linux-audit@redhat.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov, linux-kernel@vger.kernel.org, Richard Guy Briggs <rgb@redhat.com> Subject: [PATCH v23 19/23] audit: add support for non-syscall auxiliary records Date: Fri, 20 Nov 2020 12:15:03 -0800 [thread overview] Message-ID: <20201120201507.11993-20-casey@schaufler-ca.com> (raw) In-Reply-To: <20201120201507.11993-1-casey@schaufler-ca.com> Standalone audit records have the timestamp and serial number generated on the fly and as such are unique, making them standalone. This new function audit_alloc_local() generates a local audit context that will be used only for a standalone record and its auxiliary record(s). The context is discarded immediately after the local associated records are produced. Signed-off-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Cc: linux-audit@redhat.com To: Richard Guy Briggs <rgb@redhat.com> --- include/linux/audit.h | 8 ++++++++ kernel/audit.h | 1 + kernel/auditsc.c | 33 ++++++++++++++++++++++++++++----- 3 files changed, 37 insertions(+), 5 deletions(-) diff --git a/include/linux/audit.h b/include/linux/audit.h index ba1cd38d601b..786d065a64ef 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -289,6 +289,8 @@ static inline int audit_signal_info(int sig, struct task_struct *t) /* Public API */ extern int audit_alloc(struct task_struct *task); extern void __audit_free(struct task_struct *task); +extern struct audit_context *audit_alloc_local(gfp_t gfpflags); +extern void audit_free_context(struct audit_context *context); extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1, unsigned long a2, unsigned long a3); extern void __audit_syscall_exit(int ret_success, long ret_value); @@ -558,6 +560,12 @@ static inline void audit_log_nfcfg(const char *name, u8 af, extern int audit_n_rules; extern int audit_signals; #else /* CONFIG_AUDITSYSCALL */ ++static inline struct audit_context *audit_alloc_local(gfp_t gfpflags) +{ + return NULL; +} +static inline void audit_free_context(struct audit_context *context) +{ } static inline int audit_alloc(struct task_struct *task) { return 0; diff --git a/kernel/audit.h b/kernel/audit.h index ce41886807bb..3f2285e1c6e0 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -99,6 +99,7 @@ struct audit_proctitle { struct audit_context { int dummy; /* must be the first element */ int in_syscall; /* 1 if task is in a syscall */ + bool local; /* local context needed */ enum audit_state state, current_state; unsigned int serial; /* serial number for record */ int major; /* syscall number */ diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 4af5861bcb9a..5bfee5d0812d 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -929,11 +929,13 @@ static inline void audit_free_aux(struct audit_context *context) } } -static inline struct audit_context *audit_alloc_context(enum audit_state state) +static inline struct audit_context *audit_alloc_context(enum audit_state state, + gfp_t gfpflags) { struct audit_context *context; - context = kzalloc(sizeof(*context), GFP_KERNEL); + /* We can be called in atomic context via audit_tg() */ + context = kzalloc(sizeof(*context), gfpflags); if (!context) return NULL; context->state = state; @@ -967,7 +969,8 @@ int audit_alloc(struct task_struct *tsk) return 0; } - if (!(context = audit_alloc_context(state))) { + context = audit_alloc_context(state, GFP_KERNEL); + if (!context) { kfree(key); audit_log_lost("out of memory in audit_alloc"); return -ENOMEM; @@ -979,8 +982,27 @@ int audit_alloc(struct task_struct *tsk) return 0; } -static inline void audit_free_context(struct audit_context *context) +struct audit_context *audit_alloc_local(gfp_t gfpflags) { + struct audit_context *context = NULL; + + context = audit_alloc_context(AUDIT_RECORD_CONTEXT, gfpflags); + if (!context) { + audit_log_lost("out of memory in audit_alloc_local"); + goto out; + } + context->serial = audit_serial(); + ktime_get_coarse_real_ts64(&context->ctime); + context->local = true; +out: + return context; +} +EXPORT_SYMBOL(audit_alloc_local); + +void audit_free_context(struct audit_context *context) +{ + if (!context) + return; audit_free_module(context); audit_free_names(context); unroll_tree_refs(context, NULL, 0); @@ -991,6 +1013,7 @@ static inline void audit_free_context(struct audit_context *context) audit_proctitle_free(context); kfree(context); } +EXPORT_SYMBOL(audit_free_context); static int audit_log_pid_context(struct audit_context *context, pid_t pid, kuid_t auid, kuid_t uid, @@ -2228,7 +2251,7 @@ EXPORT_SYMBOL_GPL(__audit_inode_child); int auditsc_get_stamp(struct audit_context *ctx, struct timespec64 *t, unsigned int *serial) { - if (!ctx->in_syscall) + if (!ctx->in_syscall && !ctx->local) return 0; if (!ctx->serial) ctx->serial = audit_serial(); -- 2.24.1
WARNING: multiple messages have this Message-ID (diff)
From: Casey Schaufler <casey@schaufler-ca.com> To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: john.johansen@canonical.com, linux-kernel@vger.kernel.org, Richard Guy Briggs <rgb@redhat.com>, linux-audit@redhat.com, sds@tycho.nsa.gov Subject: [PATCH v23 19/23] audit: add support for non-syscall auxiliary records Date: Fri, 20 Nov 2020 12:15:03 -0800 [thread overview] Message-ID: <20201120201507.11993-20-casey@schaufler-ca.com> (raw) In-Reply-To: <20201120201507.11993-1-casey@schaufler-ca.com> Standalone audit records have the timestamp and serial number generated on the fly and as such are unique, making them standalone. This new function audit_alloc_local() generates a local audit context that will be used only for a standalone record and its auxiliary record(s). The context is discarded immediately after the local associated records are produced. Signed-off-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Cc: linux-audit@redhat.com To: Richard Guy Briggs <rgb@redhat.com> --- include/linux/audit.h | 8 ++++++++ kernel/audit.h | 1 + kernel/auditsc.c | 33 ++++++++++++++++++++++++++++----- 3 files changed, 37 insertions(+), 5 deletions(-) diff --git a/include/linux/audit.h b/include/linux/audit.h index ba1cd38d601b..786d065a64ef 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -289,6 +289,8 @@ static inline int audit_signal_info(int sig, struct task_struct *t) /* Public API */ extern int audit_alloc(struct task_struct *task); extern void __audit_free(struct task_struct *task); +extern struct audit_context *audit_alloc_local(gfp_t gfpflags); +extern void audit_free_context(struct audit_context *context); extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1, unsigned long a2, unsigned long a3); extern void __audit_syscall_exit(int ret_success, long ret_value); @@ -558,6 +560,12 @@ static inline void audit_log_nfcfg(const char *name, u8 af, extern int audit_n_rules; extern int audit_signals; #else /* CONFIG_AUDITSYSCALL */ ++static inline struct audit_context *audit_alloc_local(gfp_t gfpflags) +{ + return NULL; +} +static inline void audit_free_context(struct audit_context *context) +{ } static inline int audit_alloc(struct task_struct *task) { return 0; diff --git a/kernel/audit.h b/kernel/audit.h index ce41886807bb..3f2285e1c6e0 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -99,6 +99,7 @@ struct audit_proctitle { struct audit_context { int dummy; /* must be the first element */ int in_syscall; /* 1 if task is in a syscall */ + bool local; /* local context needed */ enum audit_state state, current_state; unsigned int serial; /* serial number for record */ int major; /* syscall number */ diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 4af5861bcb9a..5bfee5d0812d 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -929,11 +929,13 @@ static inline void audit_free_aux(struct audit_context *context) } } -static inline struct audit_context *audit_alloc_context(enum audit_state state) +static inline struct audit_context *audit_alloc_context(enum audit_state state, + gfp_t gfpflags) { struct audit_context *context; - context = kzalloc(sizeof(*context), GFP_KERNEL); + /* We can be called in atomic context via audit_tg() */ + context = kzalloc(sizeof(*context), gfpflags); if (!context) return NULL; context->state = state; @@ -967,7 +969,8 @@ int audit_alloc(struct task_struct *tsk) return 0; } - if (!(context = audit_alloc_context(state))) { + context = audit_alloc_context(state, GFP_KERNEL); + if (!context) { kfree(key); audit_log_lost("out of memory in audit_alloc"); return -ENOMEM; @@ -979,8 +982,27 @@ int audit_alloc(struct task_struct *tsk) return 0; } -static inline void audit_free_context(struct audit_context *context) +struct audit_context *audit_alloc_local(gfp_t gfpflags) { + struct audit_context *context = NULL; + + context = audit_alloc_context(AUDIT_RECORD_CONTEXT, gfpflags); + if (!context) { + audit_log_lost("out of memory in audit_alloc_local"); + goto out; + } + context->serial = audit_serial(); + ktime_get_coarse_real_ts64(&context->ctime); + context->local = true; +out: + return context; +} +EXPORT_SYMBOL(audit_alloc_local); + +void audit_free_context(struct audit_context *context) +{ + if (!context) + return; audit_free_module(context); audit_free_names(context); unroll_tree_refs(context, NULL, 0); @@ -991,6 +1013,7 @@ static inline void audit_free_context(struct audit_context *context) audit_proctitle_free(context); kfree(context); } +EXPORT_SYMBOL(audit_free_context); static int audit_log_pid_context(struct audit_context *context, pid_t pid, kuid_t auid, kuid_t uid, @@ -2228,7 +2251,7 @@ EXPORT_SYMBOL_GPL(__audit_inode_child); int auditsc_get_stamp(struct audit_context *ctx, struct timespec64 *t, unsigned int *serial) { - if (!ctx->in_syscall) + if (!ctx->in_syscall && !ctx->local) return 0; if (!ctx->serial) ctx->serial = audit_serial(); -- 2.24.1 -- Linux-audit mailing list Linux-audit@redhat.com https://www.redhat.com/mailman/listinfo/linux-audit
next prev parent reply other threads:[~2020-11-20 20:36 UTC|newest] Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <20201120201507.11993-1-casey.ref@schaufler-ca.com> 2020-11-20 20:14 ` [PATCH v22 00/23] LSM: Module stacking for AppArmor Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 01/23] LSM: Infrastructure management of the sock security Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 02/23] LSM: Create and manage the lsmblob data structure Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-12-28 17:54 ` Mimi Zohar 2020-12-28 17:54 ` Mimi Zohar 2020-12-28 19:22 ` Casey Schaufler 2020-12-28 19:22 ` Casey Schaufler 2020-12-28 19:43 ` Mimi Zohar 2020-12-28 19:43 ` Mimi Zohar 2020-12-28 19:24 ` Mimi Zohar 2020-12-28 19:24 ` Mimi Zohar 2020-12-28 20:06 ` Casey Schaufler 2020-12-28 20:06 ` Casey Schaufler 2020-12-28 22:14 ` Mimi Zohar 2020-12-28 22:14 ` Mimi Zohar 2020-12-28 23:20 ` Casey Schaufler 2020-12-28 23:20 ` Casey Schaufler 2020-12-29 1:53 ` Mimi Zohar 2020-12-29 1:53 ` Mimi Zohar 2020-12-29 13:53 ` Mimi Zohar 2020-12-29 13:53 ` Mimi Zohar 2020-12-29 18:46 ` Casey Schaufler 2020-12-29 18:46 ` Casey Schaufler 2020-12-29 19:16 ` Mimi Zohar 2020-12-29 19:16 ` Mimi Zohar 2020-11-20 20:14 ` [PATCH v23 03/23] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 04/23] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 05/23] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 06/23] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 07/23] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 08/23] LSM: Use lsmblob in security_task_getsecid Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 09/23] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 10/23] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 11/23] IMA: Change internal interfaces to use lsmblobs Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 12/23] LSM: Specify which LSM to display Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 13/23] LSM: Ensure the correct LSM context releaser Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 14/23] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:14 ` [PATCH v23 15/23] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler 2020-11-20 20:14 ` Casey Schaufler 2020-11-20 20:15 ` [PATCH v23 16/23] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler 2020-11-20 20:15 ` Casey Schaufler 2020-11-20 20:15 ` [PATCH v23 17/23] NET: Store LSM netlabel data in a lsmblob Casey Schaufler 2020-11-20 20:15 ` Casey Schaufler 2020-11-20 20:15 ` [PATCH v23 18/23] LSM: Verify LSM display sanity in binder Casey Schaufler 2020-11-20 20:15 ` Casey Schaufler 2020-11-20 20:15 ` Casey Schaufler [this message] 2020-11-20 20:15 ` [PATCH v23 19/23] audit: add support for non-syscall auxiliary records Casey Schaufler 2020-11-20 23:06 ` kernel test robot 2020-11-20 23:06 ` kernel test robot 2020-11-20 23:06 ` kernel test robot 2020-11-21 0:36 ` kernel test robot 2020-11-21 0:36 ` kernel test robot 2020-11-21 7:36 ` kernel test robot 2020-11-21 7:36 ` kernel test robot 2020-11-21 7:36 ` kernel test robot 2020-11-20 20:15 ` [PATCH v23 20/23] Audit: Add new record for multiple process LSM attributes Casey Schaufler 2020-11-20 20:15 ` Casey Schaufler 2020-11-20 22:51 ` kernel test robot 2020-11-20 22:51 ` kernel test robot 2020-11-20 22:51 ` kernel test robot 2020-11-21 0:02 ` kernel test robot 2020-11-21 0:02 ` kernel test robot 2020-11-21 0:02 ` kernel test robot 2020-11-20 20:15 ` [PATCH v23 21/23] Audit: Add a new record for multiple object " Casey Schaufler 2020-11-20 20:15 ` Casey Schaufler 2020-11-20 20:15 ` [PATCH v23 22/23] LSM: Add /proc attr entry for full LSM context Casey Schaufler 2020-11-20 20:15 ` Casey Schaufler 2020-11-20 20:15 ` [PATCH v23 23/23] AppArmor: Remove the exclusive flag Casey Schaufler 2020-11-20 20:15 ` Casey Schaufler
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